sparring with, including mitt romney, and the point is that they want to be prepared for the worst when they get to the real debate, so if they feel defensive, as some of romney's aides are worried that he might get, he can sort of get it out of his system and react in debate prep as opposed to doing it during the real thing. >> and, dana, you say he is the go-to guy for the republicans for many, many candidates. does he actually take on the persona of the person that they're debating, you know? does he try to impersonate obama in any way? >> i tried to get him to role play to see if there was sort of an "snl" future for him. >> exactly. >> he wouldn't go there with me. i have asked that question, and for rob portman, i'm told that he doesn't, you know, imitate barack obama per se, but he really embodies him with regard to the kind of -- the way he talks, the kind of things that he would say, the phrase of a sentence or two, and, of course, how he feels about policies.